Gasification burner with a cleansing device and a cut-off member



Nov. 21, 1939. H E s b 2,181,014

GASIFICATION BURNER WITH A CLEANSING DEVICE AND A CUT-OFF MEMBER Filed July 23, 1938 2 Sheets-Sheet 1 INVENTORI HERMAN EKSTROM ATTORNEYS Nov 21, 1939. H. EKSTROM 2.1810 4 GASIFICATION BURNER WITH A CLEANSING DEVICE AND A CUT-OFF MEMBER Filed July 23, 1938 2 Sheets-Sheet 2 m? If s?? 1* 5:555

|NVENTOR= HERMAN EKGTROM A TbRNm s Patented Nov. 21, 1939 STATES rarest FFICE ENG DEVICE AND A CUT-OFF MEMBER Herman Ekstriim, Stockholm, Sweden Application July 23, 1938, Serial No. 220,859

In Sweden April 23, 1937 l 2 Claims. (01. 158-120) The present invention refers to an arrangement in such gasification burners, in which a gas control member and a nozzle cleansing memher are controlled by'a common adjusting device, and in which the control member performs an opening and closing movement independent of the cleansing member, within those limits at least which correspond to a fully closed and a fully open gas supply, while the cleansing memher performs its cleansing movement directed toward the nozzle only after the adjusting device is actuated beyond the limit corresponding to full gas supply.

In known burners of this type, the control member is opened and closed altogether independently of the cleansing member, it is true, but if the cleansing needle has been moved up in cleansing position, the cleansing member will be returned from cleansing into non-cleansing position only at the time of closing of the control member. This involves a certain disadvantage in the cleansing operation, in-that the cleansing member does not permit of being moved up and down without also including a certain amount of dead or lost motion of said cleansing member .by which, however, no useful purpose is served. Now, this disadvantage is obviated according to the present invention by the feature that the cleansing member, while being moved up into cleansing position, or after it has reached this position, is adapted to be connected with the adjusting member, so that the cleansing member commences to return from cleansing into noncleansing position at the time the control memher commences the motion interval corresponding to the movement thereof from a more than open position into the position corresponding to full gas supply.

According to an embodiment of the invention,

this is efiected, in case the control member is constituted by a needle valve adapted to be screwed,

and the cleansing member is constituted by'a' toothed rack provided with a cleansing needle, said rack engaging a pinion loosely mounted on the spindle oi the needle valve, the hub of which pinion is provided with a slit over a certain portion of the circumference thereof, in which a pin provided on the spindle is displaceable, by 5 the feature that the slit extends obliquely for a portion of the length thereof at least, counted from the oneend thereof, in amanner such that,

when the cleansing member is moved up into cleansing position, a. displacement will be imparted to the pinion on the spindle so as to cause the same to be clamped fast between the pin-and an abutment provided on the spindle.

Other features characteristic of the invention will be explained more closely in the following,

in connection with the description of the forms .5

of embodiment illustrated in the accompanying drawings.

Fig. 1 .is an elevation of a gasification burner with the parts concerned with the invention shown in section online II in Fig. 2. Here, 10

the control member takes the closed position and the cleansing member the inoperative position. v

Fig. 2 shows a section on line II-II in Fig. y l V, d Fig. 3 shows a section similar to Fig. l with the control member in the position corresponding to fully open gas supply, that is to say to full flame, while the cleansing member is still in the inoperative position but about to com- 20 mence its cleansing movement upon a further movement of the control member. Fig. 4 shows a section corresponding to Fig. 2 with the control member in the position shown Fig. 3. .25 Fig. 5 shows the some section as Figs. 2 and 4, but with the cleansing member moved up into cleansing position. i

Fig. 6 shows a section on line VI-VI in Fig. 1. Fig. 7 shows a detail of Fig. lto a larger scale. 30

Figs. 8, l0 and 12 show three further embodiments, and Figs. 9, 11 and 13 illustrate a detail of Figs. 8, 10 and 12 respectively to a larger scale. The gas enters through the opening i, said gas flowing through the chamber 2 and the chamber 3 at right angles th'ereto,.to the nozzle opening 5 of the burner nozzle 5. i3 designates the needle valve of the control member. I The valve spindle l of the control member is provided with a threaded portion, which is-screwed'into the burner housing and forms the adjusting device 8. A hand wheel, not shown, or the like is provided on an extension S of the valve spindle outside the burner housing.

When the valve spindle l is turned, the control member't will thus be displaced toward or from the valve seat.

I The chamber 3, which is of a circular cross section in the example shown, has a displace'able cleansing member arranged therein with a cer- 5 tain play for the flow of the gas, said cleansing member taking the form of a rod ill with a cleansing needle ll adapted to be introduced into the nozzle opening i when cleansing is to be undertaken. The side of the rod 10 facing the 55 valve spindle 1 is formed with teeth l2 engaging a pinion l3 loosely mounted on the valve spindle 1.

One or two peripheral slits M are provided in the hub of the pinion IS on the one side of the teeth of the pinion, said slits extending over a portion of the circumference of the hub. This slit or these slits l4 are engaged by a pin [5 secured in the valve spindle The magnitude of the peripheral extension of the slit or slits is adapted with respect to the pitch of the threads of the adjusting device 8.

Now, a portion l6 of the slit M is obliquely arranged, according to the invention, in the form of embodiment shown in Figs. 1-7, so that when the spindle l is turned, the pin i 5 will displace the pinion l3 toward the threaded portion 8 of the valve spindle so as to clamp fast the pinion to this portion of the spindle. Upon continued turning in the same direction, the pinion is now entrained in the movement of the spindle, the cleansing member being moved up into cleansing position, Fig. 5. When the spindle 7 is turned in the opposite direction, the cleansing member will then immediately be moved downwardly again by reason of the clamping of the pinion onto the spindle. Only after the cleansing member has returned into the position shown in Fig. 4, will the hub be released from its engagement with the spindle, and should the latter be turned further, the control member 6 will be then moved from fully open position into closed position.

By this arrangement, the advantage is gained over the arrangement according to the Swedish Patent N 0. 87,773, for example, that the cleansing needle is permitted by small turning movements of the spindle 7 to be moved up and down in the nozzle without any dead motion between two consecutive movements in opposite directions. At the same time, the result will also be obtained that not only the opening movement of the control member but the closing movement thereof as well will be entirely independent of the movement of the cleansing member, in that the latter is moved from inoperative position into operative position and back again into inoperative position, while the control member is fully open or more than fully open, and consequently does not perform any controlling action. By this arrangement, the possibility of a properly and easily made adjustment of the control member 6 is increased, while the cleansing member will at the same time become equivalent to a cleansing member entirely independent of the control member, in spite of the same being still operated by means of the same spindle 7 as the control member 8.

In the embodiment according to Figs. 8 and 9, the pinion I3 is conceived as being connected with the spindle I by the pin it being wedged into the slit l4 provided with a wedge-shaped restriction I! in the one end thereof. According to Figs. 10 and 11, the same effect is obtained by the feature that the slit Hi is in the proximity of its one end provided with a little projection or abutment it, while the pin is formed to be resilient, for instance by a slit it. If desired, the abutment may be resilient.

Finally, the same effect will be obtained according to Figs. 12 and 13 by the fact that the slit M has been provided in the one end thereof with a small magnetized piece of steel 20, which, when the pin, which in this case at least is made from iron or steel, is brought into contact therewith, is adapted to retain the pinion 13 at the pin and thus at the spindle 7.

Having now particularly described the nature of my invention and the manner of its operation what I claim is:

1. An apparatus for a gasification burner having a casing and a control member capable of movement from closed to open position in a chamber in said casing, comprising a needle valve having a spindle screw threaded in the casing, a cleansing member movable in said chamber from a cleansing position to a non-cleansing position including a toothed rack having a cleansing needle, a pinion loosely mounted on the spindle of said needle valve, said toothed rack engaging with said pinion, means allowing limited dis placement of the needle valve spindle with respect to said pinion, and operative means for locking the pinion upon said valve spindle upon actuation and movement of the cleansing member for cleansing purposes so as to allow said cleansing member to be retracted to its noncleansing position simultaneously with the beginning of the movement of the control member through a predetermined motion interval to an open position corresponding simply to full gas supply, and said locking means releasing the pinion from its locked position with respect to said valve spindle upon the toothed rack reaching the limit of its motion in said chamber in which it operates.

2. An apparatus for a gasification burner having a casing and a control member capable of movement from closed to open position in a chamber in said casing, comprising a needle valve having a spindle screw threaded in the casing, a cleansing member movable in said chamber from a cleansing position to a non-cleansing position including a toothed rack having a cleansing needle, a pinion loosely mounted on the spindle of said needle valve, said toothed rack engaging with said pinion, means allowing limited displacement of the needle valve spindle with respect to the pinion, including a hub upon said pinion having a slit formed therein over part of W the circumference thereof, and a pin fixed on the needle valve spindle located in the slit of said hub so as to be displaceable therein in limited manner, and operative means for locking the pinion upon said valve spindle upon actuation and movement of the cleansing member for cleansing purposes so as to allow said cleansing member to be retracted to its non-cleansing position simultaneously with the beginning of the movement of the control member through a predetermined motion interval to an open position corresponding simply to full gas supply, and said locking means releasing the pinion from its locked position with respect to said valve spindle upon the toothed rack reaching the limit of its motion in said chamber in which it operates.

HERMAN EKSTRCSM. 

